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Hedging Activities - Narrative (Details)
€ in Millions, $ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2025
USD ($)
Jun. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Nov. 05, 2025
EUR (€)
Sep. 30, 2025
CAD ($)
Sep. 30, 2025
EUR (€)
Sep. 30, 2025
USD ($)
Mar. 31, 2025
CAD ($)
Mar. 31, 2025
EUR (€)
Mar. 31, 2025
USD ($)
Derivative [Line Items]                        
Gains or losses reclassified from accumulated other comprehensive loss $ 0   $ 0 $ 0 $ 0              
Currency swap | Cash Flow Hedges | Derivatives designated for hedge accounting                        
Derivative [Line Items]                        
Gains or losses reclassified from accumulated other comprehensive loss $ (7,000,000)                      
Floating interest rate swaps | Cash Flow Hedges | Derivatives designated for hedge accounting                        
Derivative [Line Items]                        
Notional amounts of derivative   $ 1,400,000,000                    
Notional amount, entered into during period   $ 550,000,000                    
CAD | Currency swap | Net Investment Hedging | Derivatives designated for hedge accounting                        
Derivative [Line Items]                        
Notional amounts of derivative             $ 6,500     $ 6,500    
EUR | Currency swap | Fair Value Hedges | Derivatives designated for hedge accounting                        
Derivative [Line Items]                        
Notional amounts of derivative | €               € 1,100     € 1,100  
Settled at fair value, net | €               € 600        
EUR | Currency swap | Fair Value Hedges | Derivatives designated for hedge accounting | Subsequent Event                        
Derivative [Line Items]                        
Acquired at fair value, net | €           € 600            
USD | Floating interest rate swaps | Fair Value Hedges | Derivatives designated for hedge accounting                        
Derivative [Line Items]                        
Notional amounts of derivative                 $ 750,000,000     $ 750,000,000
USD | Floating interest rate swaps | Cash Flow Hedges | Derivatives designated for hedge accounting                        
Derivative [Line Items]                        
Notional amounts of derivative                 $ 0     $ 850,000,000